Table 2 Number of clinical malaria cases, incidence rates and incidence rate ratios (IRR) of the follow-up study
| Â | Total child-years in the study | Total child-years at riska | Children with at least one clinical malaria case: n (%) | Clinical malaria cases | Incidence rate: per child-years at risk (95% CI) | IRR (95% CI) |
|---|---|---|---|---|---|---|
Overall | 235.7 | 231.5 | 96 (35.0%) | 110 | 0.5 (0.4–0.5) | – |
Focal area | ||||||
 A | 105.0 | 103.7 | 29 (27.6%) | 34 | 0.3 (0.2–0.4) | Reference |
 B | 57.6 | 55.5 | 53 (67.9%) | 56 | 1.0 | 3.3 (1.2–5.1) |
 C | 73.0 | 72.2 | 14 (15.2%) | 20 | 0.3 (0.2–0.4) | 1.0 (0.6–1.7) |
Intervention arm | ||||||
 Control | 69.5 | 68.5 | 21 (25.6%) | 26 | 0.4 (0.3–0.5) | Reference |
 HI | 58.6 | 58.3 | 5 (8.2%) | 7 | 0.1 (0.1–0.2) | 0.3 (0.1–0.7) |
 LSM | 67.1 | 65.4 | 43 (52.4%) | 44 | 0.7 (0.6–0.8) | 1.8 (1.1–2.9) |
 HI & LSM | 40.4 | 39.1 | 27 (55.1%) | 33 | 0.8 (0.7–1.0) | 2.0 (1.2–3.3) |
Age in months | ||||||
 6.0–11.9 | 44.9 | 44.8 | 2 (4.0%) | 2 | 0.04 (0.01–0.2) | Reference |
 12.0–23.9 | 77.9 | 76.3 | 33 (38.8%) | 41 | 0.5 (0.4–0.7) | 12.5 (3.0–51.7) |
 24.0–59.9 | 112.8 | 110.2 | 61 (43.9%) | 67 | 0.6 (0.5–0.7) | 15.0 (3.7–61.2) |